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Towards Exascale Parallel Delaunay MeshGeneration

Chrisochoides, Nikos, Andrey Chernikov, Andriy Fedorov, Andriy Kot,Leonidas Linardakis, and Panagiotis Foteinos

Proceedings, 18th International Meshing Roundtable, Springer-Verlag, pp.319-336, October 25-28 2009


18th International Meshing Roundtable
Salt Lake City, UT, USA.
October 25-28, 2009

Center for Real-Time Computing
The College of William and Mary
Williamsburg, VA 23185

Mesh generation is a critical component for many (bio-)engineering applications. However, parallel mesh generation codes, which are essential for these applications to take the fullest advantage of the high-end computing platforms, belong to the broader class of adaptive and irregular problems, and are among the most complex, challenging, and labor intensive to develop and maintain. As a result, parallel mesh generation is one of the last applications to be installed on new parallel architectures. In this paper we present a way to remedy this problem for new highlyscalable architectures. We present a multi-layered tetrahedral/triangular mesh generation approach capable of delivering and sustaining close to 1018 of concurrent work units.We achieve this by leveraging concurrency at different granularity levels using a hybrid algorithm, and by carefully matching these levels to the hierarchy of the hardware architecture. This paper makes two contributions: (1) a new evolutionary path for developing multi-layered parallel mesh generation codes capable of increasing the concurrency of the state-of-the-art parallel mesh generation methods by at least 10 orders of magnitude and (2) a new abstraction for multi-layered runtime systems that target parallel mesh generation codes, to efficiently orchestrate intra- and inter-layer data movement and load balancing for current and emerging multi-layered architectures with deep memory and network hierarchies.

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